pypi deploys

[lheagy]

• update pypi credentials
• update appveyor and travis to auto-deploy to pypi on tags
  • includes upload of wheel files from appveyor

[codecov]

Codecov Report

Merging #97 into master will decrease coverage by 18.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #97       +/-   ##
==========================================
- Coverage   76.07%   57.8%   -18.28%     
==========================================
  Files          17      17               
  Lines        5910    5910               
==========================================
- Hits         4496    3416     -1080     
- Misses       1414    2494     +1080

Impacted Files	Coverage Δ
discretize/TreeMesh.py	23.25% <0%> (-49.43%)	⬇️
discretize/MeshIO.py	65.38% <0%> (-20.06%)	⬇️
discretize/Tests.py	67.63% <0%> (-11.12%)	⬇️

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